I am running Umbraco 7.6.4 and I have been trying to use the preview system to check content changes on different pages, on every page when I click the preview button I am shown a 404 page The URL contains the following

/umbraco/preview/?id=1066

Looking on the machine the App_Data\Preview Folder is empty which I believe needs cache files for preview to work.

After much testing I have established that I can get the preview to work if I comment out my RegisterEvents class that inherits from ApplicationEventHandler

The code is as follows

public class RegisterEvents : ApplicationEventHandler { protected override void ApplicationStarting(UmbracoApplicationBase umbracoApplication,ApplicationContext applicationContext) { base.ApplicationStarting(umbracoApplication, applicationContext); }

    protected override void ApplicationStarted(UmbracoApplicationBase umbracoApplication,ApplicationContext applicationContext)
    {
        RouteConfig.RegisterRoutes(RouteTable.Routes);
        AppConfiguration.RegisterGlobalFilters(GlobalConfiguration.Configuration);
        FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
        DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;

        base.ApplicationStarted(umbracoApplication, applicationContext);
    }
}

If I remove this class everything works correctly I have also tried using the Global.asax method but with the same issues I believe the above is the correct way to register events though.

Is this an issue with the Umbraco preview system or have I done some wrong in the above or missed out a setting any help would be a great help